fix(render): return views when destroyed in ViewContainer

Closes angular#1316

Author: tbosch

modules/angular2/src/render/dom/view/view_hydrator.js

@@ -180,7 +180,9 @@ export class RenderViewHydrator {
 
   _viewContainerDehydrateRecurse(viewContainer) {
     for (var i=0; i<viewContainer.views.length; i++) {
-      this._viewDehydrateRecurse(viewContainer.views[i]);
+      var view = viewContainer.views[i];
+      this._viewDehydrateRecurse(view);
+      this._viewFactory.returnView(view);
     }
     viewContainer.clear();
   }

modules/angular2/test/render/dom/view/view_hydrator_spec.js

@@ -223,6 +223,17 @@ export function main() {
         expect(viewFactory.spy('returnView')).toHaveBeenCalledWith(shadowView);
       });
 
+      it('should clear views in ViewContainers', () => {
+        createAndHydrate(null, null);
+        var vc = hostView.getOrCreateViewContainer(0);
+        var childView = createEmptyView();
+        vc.insert(childView);
+
+        dehydrate(hostView);
+
+        expect(viewFactory.spy('returnView')).toHaveBeenCalledWith(childView);
+      });
+
       it('should clear imperatively added child components', () => {
         var shadowView = createEmptyView();
         createAndHydrate(createProtoView(), shadowView);